Gasket for handhole plates for water-tube boilers



A P. H. MAHONEY. GASKET FOR HANDHOYL PLATES FOR WATER .TUBE BOLERS. APPLICATION HLED'MAY 3, 1919.

1,424,930@V K v Patent-e6 A110. 8, 1922.

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PATRICK E. MAEONEY, OF CHICAGO, ILLINOIS.

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Specification of Letters Patent.

Patented Aug. 8, i922.

Application led May 3, 1919. Serial No. 294,531. f

will be durable, economical and eliicient in use.

. A further object is to provide a gasket for a hand-hole plate which will be adapted to be easily and quickly removed or put into use.

Other objects will appear hereinafter.

The invent-ion consists in the combinations and arrangements of parts hereinafter described and claimed.

rlhe invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. l, is a plan view of a hand-hole on a water tube boiler,

Fig. 2, is a fragmentary section of a water tube boiler embodying the invention,

Fig. 3, is a perspective view of the invention, and

Fig. 4l, represents a vertical sectional view of Fig. 3.

To afford means of cleaning the water tube boilers, hand-holes 14C are provided in the front wall 5of the water chamber 6. The purpose of these holes is to give access to the water tubes 7 so that the same may be cleaned and have the coating, which accumulates on the inside thereof, scraped or removed therefrom. To close these hand-holes in the wall 5, are provided what are popularly termed as hand-hole plates 8, from which vertically project threaded studs 9. In placing the hand-hole plate 8 into operative position, it is inserted into the water chamber 6 of the water tube boiler, with the shoulders of the hand hole plate engaging the wall 5 of the boiler. Interposed between the hand-hole plate 8 and the wall 5 is a gasket 10.- Co-operating with the hand-hole plate is a closing plate 11 positioned against the wall 5 of the boiler on the opposite face to which the hand-hole plate is placed. The stud 9 projects through the plate l1, and co-operating therewith is a nut l2, by means of which the different parts are securely clamped in position.

Many different types of water tube boilers are in existence, and also many different types of hand-hole plates, but the hand-hole plate which is now used most universally with water tube boilers is what is known as the Phoenix hand-hole plate. Where the Phoenix hand-hole plate is to be used, the hole 1A; in the front wall 5 of the boiler is constructed substantially circular with two bulging portions diametrically opposite each other, as clearly seen in Fig. l; The reason for this is because the hand-hole plate is constructed substantially circular, having two bulging portions diametrically arranged opposite each other, said gaskets being turned slightly inwardly at points where the bulged portions begin, to afford sharp edges at said points. The plate is, of course, larger than the hole with which it is used, but when the plate is turned so that the center of the circular part of the plate is opposite the bulgingpart of the hole, the plate can then be easily removed by sliding one of the bulging ends of the plate through the hole. This particular form of structure in the hand-hole plate is consequently seen to be an advantageous and useful feature of the hand-hole plate, inasmuch as each hand-hole plate can be removed separately and separately supplied with a new one, in case of necessity, without disturbing any of the other hand-hole plates. If it were not possible to insert the hand-hole plate through the handhole, all of the handhole plates in this row would have to be removed to allow passing of the handhole plates up from the base of the water tube chamber to the point at which it is to be used.

Heretofore, circular gaskets formed of rubber or asbestos have been used with these Phoenix hand-hole plates, but because of the structure of the hand-hole plate, these gaskets have proved unsatisfactory, inas much as the continuous close engagement around the edge or flange of the hand-hole plate is not accomplished by the use of such gaskets. The result was that the water tube boiler leaked where these hand-hole platesV were positioned, resulting in a corroding of the stud 9. This occasioned frequent removal of the hand-hole plates, and, because vsecurely around the entire periphery or flange of the lDhoeniX handehole plate. W ith the use of this metal gasket,l a hand-hole plate can'be removecbthe gaskettake'n off, a new gasket put on and the plate immediately secured in its operative position without any need of scraping or cleaning of said plate, as is necessary `where a rubber or asbestos gasket is used.

Located on both sides of applicants gasket, extending circuinferentially around the gasket, is provided a raised ridge. Upon the clamping of the hand-hole iplate into position, this ridge will flow vand lill up any discrepancies which may exist between the surface ofthe gasket andthe surface of the hand-hole'plate and the chamber wall, thereby assuring a close and intimate'contact.

lVhile l have illustrated and described the preferred formv of' construction for carrying my invention into effect, this is capable'of variation and modication without departing from the spirit of the invention.` il, therefore, do not wish to be lilnited'to'the precise details of construction set forth, but desire to avail myself of such variations and modifications as corne within the scope of the appended claims.

Having describe'dfrny invention, what I claiin as new and desire to secure by Letters Patent is i l.. A `lead gasket for a hand-hole plate, said vgasket `beingsubstantially circular in forni and outwardly bulged at diametrically opposite points, said gasket having `afcircuinferentially extending ridge ylocated on both'sides, substantially as described.

2. A metal gasket for a hand-hole plate, said gasket being substantially circular in form and outwardlybulged at diaine'trically opposite points, said gasket being' turned slightly inwardly at the points where said bulgedportions begin, to afford sharp edges at said point, said gasket having a circum ferentially extending ridge located on both sides, substantially as described. n

3. A lead gasket for a hand hole plate, sai( Agasket vbeing"substantially circular in ferm and outwardly'bulged at'diametrically opposite points, s'aidgasket being turned slightly inwardly wheresaid bulged portions begin, to afford sharp ledgesat said points, said gasket having a circumferentially-extending ridge located on both sides and provided with bulged portions which correspond with the bulged portions ofthe gasket, substantially as described.

In testimony whereof -I have signed vmy name to this specicationin the presence of two subscribing witnesses.

PATRCK H. MAILIONEY.

Witnesses i JOSHUA R. H. Poms, B. G. RICHARDS. 

